I’m at a wedding this weekend and have workbench separation anxiety. So for the next few days, I’ll continue building an ash sitting bench in my mind. As of right now, I’ve got everything planed to proper dimensions and the top mortises cut in the front legs. It’s slow going, given everything else I’ve got going on.
I don’t cut many mortise and tenon joints. Not as many as I do dovetails, anyway. So it may be lack of skill on my part, but my mortises never seem to be completely parallel. To compensate, though, I cut my tenons fat: to tighter than piston-fit. This allows me to ease the mortise walls to bring the joint into parallel while still keeping an overall tight fit on the joint.
After all, what’s the point of making the stock straight and square (tried and true?) if the joint is crooked?